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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcbefa37c338465909cf1f6d0e51bf3c9a3a0044a2bcb5a2ddae21842df88088' 
  AND token = 'IwDDIxzqGA1iaMyub6YDPYAdj6ZgAF4QY/k15fMlWYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}